Center pin



Sept. 29, 1925.

C. JABLOW ET AL CENTER PIN Filed Sept. 20. 1923 WITNESSES:

Patented Sept. 29, 1925. v

UNITED STATES PATENT OFFICE.

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To all who n t it comm:

Be it known that we, CHARLES JAenow,

a citizen of the United States, and a resident of East Pittsburgh, in the county of Allegheny and State of Pennsylvania, and FRANK 'L. Amen, a citizen of the'United States, and a resident of Wilkinsburg, in

the county of Allegheny and State of Penn-- s lvania, have invented a new and useful 'I mprovement in Center Pins, of which the following is a specification. I

Our invention relates to railway vehicles, and more especially to. center pin mountings for the cab and truck members that provide freedom of movement therebetween and furthe!" support the vehicle body on its drive trucks.

It is among the objects of this invention to rovide a center pin for railwa vehicles which shall permit relative swivel ing, rolling, vertical and longitudinal movement of the co-operating truck and body members, which shall be adapted to yieldingly carry the load of the cab and which shall be of simple, compact and durable construction to adequatel meet the severe workingstress to whic it may be subjected.

In designin a center pin structure for railway vehic es, under certain conditions it is essential to provide for adequate bearin surface, for swivel, rolling, vertical and limited longitudinal movements, and for suitable lubrication of the several co-operating parts. 7

Our resent invention is directed to a center pm which meets these requirements in that it provides a relatively large bearing surface, yieldingly restrains vertical movement, permits rolling of the pin member in a direction transversely of the longitudinal axis of the 'cab frame and further permits of limited longitudinal movement relative to the supporting trucks.

In the accompanying drawings constituting a part hereof and in which like reference characters designate like parts;

Figure 1 is'a view, partially in side elevation and partially in cross-section, of a fragmentary ortion of a railway vehicle embodying t e principles of our invention and Fig. 2 is a view thereof, partially in end elevation and partially in cross-section.

Referring to Fig. 1, the structure therein tudinal movement of t e pin on illustrated comprises a truck frame 1 that 1s provided with vertical pedestal jaws 2 avmg journal boxes 3 dis sed therein for JOHI'lmhhg the wheeled ax es 4 in the usual manner. A box-shaped cross-tie 5 is secured at 1ts' flanged ends 6 to the truck frames 1 by sultable bolts 7. The cross-tie 5 is provided w1th a central relatively dee recess 8 and a plural ty of outer relative y shallow recesses 9: 'A vertically slidable bearing pad '10 is mounted in the recess 8 and is provided with a groove 11 runnin alon the lon 'tudinal axis of the truck Th5 outer v v irlls of the bearing pad extend upwardlyto'constltute an annular flange 12. A plurality of coil springs 13 are interposed between the cross-tie 5 and the flange 12 of the pad 10 to ieldin 1y support the latter. The lower en s of t e sprlngs 13 recesses 9.

A center pin 14 of substantially T-shape, having a convex or cylindrical seating surface 15 corresponding to and seated in the grove 11 of theflpad 10, is pivotally mounted 1n a cylindric recess 16(of a bracket 17, which is suitably secured to the sub-frame of the vehicle bod or cab 18. The-c lindrical head 15.is orter than the wal s, of the recess 8 to provide a clearance space 19 therebetween, which emits sli ht longitie pad 10. Agilate 20 is bolted to the cross-tie 5 to provi e a cover that prevents access of dirt to the bearing of the center pin and also prevents the parts from separating.

The center pin 14 is lubricated by a pi e 21 which extends into the cab 18 and may e connected to a suitable source of lubrication such as an oil reservoir or pum It is obvious from the above dbscription of our invention that the spring-borne bearing ad 10 permits yielding vertical movement tween cab 18 and cross-tie 5- and that the cylindrical head of the center pin 14 permits rolling movement of the cab 18 on the truck support. -The upper cylindrical portion of the center pin and its co-operating bracket 17 permit swivel movement of the truck relative to the vehicle body and the clearance space 19 between the center pin and recess in the cross-tie allows limited longitudinal movement, which is necessary when the vehicle passes from a tangent to are disposed in the a curve. This design lends itself to rugged construction and the wearing surfaces are accessible for lubrication.

Although we have described a s cific' embodiment of our invention, it will obvious to those skilled in the art that various modifications may be made in the details of construction without departing from the principles herein set forth. For instance, any suitable splring mounting may be substituted for t e coil springs 13, or the brackets 17 ma be an integral part of the subframe of t e vehicle body, and other modification of the cross-tie may be utilized in lace of that shown.

e claim as our invention:

1. A center pin structure for railway vehicles comprising means for providing relative swivelling and rolling, lon 'tudinal and vertical movement of the ca and truck frame.

2. A center pin structure for railway vehicles comprising means for providing relative rolling, longitudinal and resilient vertical movement of the cab and truck frame.

3. A center pin structure for railway vehicles comprising a cylindrical bracket secured to the cab under frame, a cross-tie having a recess in alinement with said bracket, a center-pin disposed in said cylindrical bracket and adapted to swivel therein, a vertically movable pad disposed in the recess of said crosstie, and a plurality of yieldin supports interposed between said pad an cross-tie. I

4. A center pin structure for railway vehicles com rising a cylindrical bracket secured to t e cab under frame, a cross-tie having a recess in alinement with said bracket,

and a center pin associated with said bracket and cross-tie and having a cylindrical T- shape head.

5. A center pin structure for railway vehicles comprising a pin of substantially T- shape having .a cylindrical seating surface, a spring-borne pad disposed in a recess of a cross-tie of the truck frame and having a cylindrical surface to engage said pin and a cylindrical bearing on the cab frame to engage said pin.

6. A center pin structure for railway vehi-v tember, 1923.

CHARLES JABLOW. FRANK L. ALBEN. 

